How to use Deduper for Outlook?

Starting Deduper

Searching for duplicates

Select some folders to search in "Search in Folders" panel (left part of the window).

Click "Search" button.

Duplicates will appear on "Found Duplicates" panel once found.

Tweaking duplicate search settings

If you are happy with found duplicates - skip this step, if not - read on. To change duplicate search settings - click "Search Settings" button. This window appears:

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If you have duplicates that are scattered across different folder and you want to find them, uncheck "Search for same folder duplicates only".

Duplicates are found by comparing fields checked on "Search Settings". If selected fields are exactly the same on all items, they are considered to be duplicates. Select more fields to find less, more accurate duplicates. Alternatively, select less fields to find more duplicates.

Tweaking duplicate removal settings

With default settings duplicates are marked for removal according to their Last Modification Date - item that was modified later is kept and the other is marked for removal. Default removal action is to remove duplicates to "Deleted Items". If you want to change these settings - click "Removal Settings". This window appears:

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It is possible to specify which item will be marked as duplicate based on creation, last modification time or size. There are also three available duplicate removal methods such as deleting, moving to folder or subject changing. Once you are done with these settings - click "Search Results" to go back to search results.

Removing found duplicates

After search is finished, click "Remove" to remove duplicates. Duplicates are removed!